fix(translate): expose sensor_grids file as an output

This is useful for post-processing the results.

pollination/honeybee_radiance/translate.py

@@ -20,3 +20,7 @@ def hbjson_to_rad_folder(self):
     sensor_grids = Outputs.list(
         description='Sensor grids information.', path='model/grid/_info.json'
     )
+
+    sensor_grids_file = Outputs.file(
+        description='Sensor grids information JSON file.', path='model/grid/_info.json'
+    )